Darkchilde killed Belasco and became the ruler of Limbo that way. One reason why Storm trying to kill Belasco did not work is because he is immoral. To kill him you need a soul sword. Now he is missing an arm is because someone used the sword he has to cut off his arm. Since one needs a magic blade to kill him, Storm without a magic blade had no way and no means of killing him. Really, LimboStorm's and Cat's only purposes in this story is to show why Illyana didn't come back totally evil, as if she was raised only by a demon all this time she surely would be. So no, nothing Illyana does in the future has to do with Limbo Storm. Oh, and Pixie's soul dagger mortally wounded Belasco, and Darkchilde used the new medallion to finish killing Belasco off. Finally she got justice.